Plaintiffs' attorney Robert Fram said his clients have powerful evidence that AT&T worked on a huge surveillance program.

Fram, a lawyer working with attorneys from the Electronic Frontier Foundation, cited a sworn declaration by former AT&T employee Mark Klein, describing a supersecure room in a building in San Francisco where AT&T assembled high-powered dating-mining equipment for a "special job" for the NSA. He said he had heard from other employees that similar operations were being put together in Los Angeles, San Diego, San Jose and Seattle.